We promise today isn't going to be all about space, but this was just too cool to pass up.…
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Says Google:

We've added the very first underwater panoramic images to Google Maps, the next step in our quest to provide people with the most comprehensive, accurate and usable map of the world. With these vibrant and stunning photos you don't have to be a scuba diver-or even know how to swim-to explore and experience six of the ocean's most incredible living coral reefs. Now, anyone can become the next virtual Jacques Cousteau and dive with sea turtles, fish and manta rays in Australia, the Philippines and Hawaii.

We've included some screenshots of our first udnerwater dive below, but you'll definitely want to visit http://maps.google.com/ocean to start exploring for yourself.